FIX: CompositeSearchResultSources more resilient to errors in indiviaul searchresultsource, will not pass exception from one
search result source if others still have valid data
FIX: FlexResourceStore catchs all exceptions, including runtime and ensures Resource is closed if its not returned
FEATURE: PerfStats profiling system which stores aggregate counts for arbitrary buckets per thread.
Stats can be logged immediately via logger and also reported via http response headers, if set in the AccessPoint
Header is written as last header before the response is rendered, so JSP rendering can not be included in these
totals.
FEATURE: Include Resource filename header "x-archive-src" and "x-archive-src-revisit" (in case of revisit records)
CHANGE: Using standard apache httpclient 3.1 implementation, not archive overlays for heritrix